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Message ID: 14600     Entry time: Thu May 9 22:26:39 2019
Author: Jon 
Type: Omnistructure 
Category: PSL 
Subject: Second ADC added to PSL Acromag crate 

This evening I added a second ADC module to the prototype Acromag chassis. This chassis can now read out all the PSL diagnostic channels.

I configured the second ADC identically to the first ("ADC0"), and assigned it IP address 192.168.113.122. I confirmed it is visible on the martian network.

There was an existing but unused DB-15 feedthrough which I used for ADC1 channels 1-7. The eighth channel I left unwired, but there are slots available in the neighboring DB-25 feedthough, if that channel is needed in the future. The channel wiring assignments are as follows.

ADC1 Channel DB-15 Feedthrough Pin
0+ 1
0- 9
1+ 2
1- 10
2+ 3
2- 11
3+ 4
3- 12
4+ 5
4- 13
5+ 6
5- 14
6+ 7
6- 15
7+ not connected
7- not connected

I tested all seven of these channels by applying a calibrated voltage source and measuring the response via the Windows Acromag software. All work and are correctly calibrated to better than 0.1%.

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